Core cap



June 30, 1931. w. H. WlC KWARE 1,812,421

gm I I m IH HHH. {WW 5 I Walter. wiolfwwra ATTORNEYS June 30, 1931. w. H. WICKWARE CORE CAP Filed June 27. 1929 2 Sheets-Sheet 2 I INVENTOR B Ywalter'j f. ZUicKwzms ATTOJJZYLZV CT D Patented June 30, 1931 UNITED STATES PATENT OFFICE WALTER H. WICKWARE, or OTTAWA, ONTARIO, CANADA, ASSIGNOR T INTER- NATIONAL PAPER COMPANY, A CORPORATION or NEW YORK CORE CAP Application filed June 27,

This invention relates to improvements in core ca s for winding cores.

In the manufacture of paper produced in long sheets and wound into rolls for the market, it is customary to wind the paper on a tubular core of paper or other fibrous material. The ends of such cores are usually protected with metal caps, to adapt them to withstand the wear and strain to which they are subjected in the manufacturing operation, as well as when they are in use in the printing press. The core must also be protected against the spreading of the'ends when prybars are inserted therein for moving the heavy roll of paper wound thereon during shipment. Such caps are provided with a notch or recess with which the driving stud or key of the winding mechanism may be engaged.

In providing the notch orrecess according to" the prior core cap constructions, the caps have been weakened, either because of the removal of the metal necessary to formv the notch, or because of thinning of the metal adjacent the recess due to the expansion of the metal in cases Where a recess instead of a notch has been provided, Also, in the prior constructions in which the cap has been drawn from one piece of sheet metal, there has been a tendency to weaken the metal because of the stresses set up therein in the drawing operation at the point of greatest strain, namely, at the end thereof where the inner and outer sleeves are joined by the connected web portion. Since in the prior constructions the notch "or recess above referred to has been cut or pressed out of the sleeve walls adj acent the end or web portion of the cap,-the weakening of the cap at the pointwhere the greatest strain occurs in use has been further accentuated. 7

An object of my invention is to produce a light and'che'ap' cap of greater strength and durability than those heretofore employed.

A further object is to produce a cap in which'thoseportions normally subjected to greatest strain are reinforced or so constructed as to better. distribute the stresses imparted thereto while in use over the whole body of the cap.

A still further object is to produce caps of 1929. Serial No. 374,005.

superior strength from lighter gauge metal and with a minimum of waste of material in manufacture.

In order to carry out the above ends, my cap is made from two pieces of sheet metal, formed into shape without thinning of the metal at any point and without strain on the metal. Reinforcement of the cap at the point of greatest strain is also brought about by overlapping flange portions on the inner and outer sleeves and welding or otherwise joining these flange portions together to form a web of multiple thickness.

Referring to the drawings:

Fig. 1 is a view of the sheet metal blank for 5 the inner sleeve, with the stud-receiving cavity centrally formed therein.

Fig. 2 is a view of the sheet metal blank for the inner sleeve, with the stud-receiving cavity formed at ends thereof.

Fig. 3 is aview of the sheet metal blank for the outer sleeve.

Fig. & is a perspective of the assembly of the finished cap with dovetailed joints.

c Fig. 5 is a cross-section on line A-A of Fig. 4, showing the cap applied to a paper core.

Fig. 6 is a perspective of the cap with inner and outer sleeves of same length.

Fig. 7 is a perspective of the finished cap with overlapping joints.

Fig. 8 is a crosssection on line BB of Fig. 7.

Fig. 9 is an enlarged cross-section on line CC of Fig. 8.

Fig. 10 is an enlarged cross-section on line D-D of Fig.8.

The inner sleeve 1 is formed from a rectangular sheet of metal 2. The first operation consists of forming the stud receiving cavity 3. This may be formed in the center of the sheet, as in Fig. 1, or at the ends, as in Fig. 2. In forming this cavity the metal is not thinned, the extra metal required be ing drawn from the adjacent edge portion of the sheet. The sheet 2 is then trimmed to the desired size and the ends dovetailed, as shown at 4 in Figs. 1 and 2. It is then rolled into cylindrical form and an outwardly extending flange 5 is turned at right angles to the cylinder at the end containing the cavity.

sleeves are securely joined together by means of spot-welding in several places, as at 9. The back wall of the stud receiving cavity is also securely joined to the outer sleeve at 10by sp0t-welding. This feature is important, as it insures that strains imparted to the shoulders llby a driving stud or key are in part transmitted to the outer sleeve.

Fig. e 'shows the preferred form of my cap, having a longer inner sleeve than outer sleeve. The dovetail joints may be in any relation, but I prefer to have the joint of the 5 inner sleeve opposite to the cavity and the joint of the outer sleeve at the cavity.

In Fig. 6 I have shown my cap with both sleeves of the same length and the joints of both sleeves at the stud-receiving cavity.

0 The stud-receiving cavity in this case extends "the entire length of the cap.

Figs. 7, 8, 9 and 10 show my cap with the longitudinal edges of the'inner and outer sleeves 1 and 6 joined by overlapping as at 'in'the cross-section Fig. 10,.the overlap is made in such a way as to provide a smooth exterior and interior of the cap at the joints. The joint of the outer sleeve 6 is overlapped only in part. The edges of the outer sleeve immediately adjacent the stud-receiving cavity 3 meet as at 14 but do not overlap and are firmly secured by spot-welding 16' to the outer wall'of the stud receiving cavity formed in the inner sleeve. joining the longitudinal edges of the sleeves results in a triple thickness of metal at the outer wall of the stud receiving cavity.

j From the above description and the draw,- ings it will be seen that among the distinctive features of my cap are the web of'double thickness formed by the sleeve flanges securely joined together and the presence 1 of. a multiple thickness of metal at theouter wall of the stud-receiving cavity, said wallsbeing securely joined together. Further, the

method of .making the cap, as described,

makes it possible to form a cap without distortion or strain on the metal and without thinning the metal at any point.

A cheaper form of my cap comprlses the inner sleeve only as at 1, Figs. 7 8, 9 and 10.

This cap isformed from a rectangular sheet of metal In substantially the samemanner as previously described for the manufacture of The two sleeves are then assembled as shown in Figs. l and 5. The flanges ofthe 12 and 13 and spot-welding at 15. As shown This method of the inner sleeve. The stud-receiving cavity 3 is first formed, preferably at the ends of the sheet The sheet is then rolled into cylindrical form with its longitudinal edges overlapped as at 12 and spotwelded as at 15, in Figs. 8, 9 and 10. An outwardly extending flange 5 is turnedat right angles to the cylinder at the end. containing the cavity. This flange should be trimmed to the exact diameter of-the core on which it is to be-used so that the end of the core will be completely protected. If desired, this flange may be turned down at its outer edge to form a short outer sleeve which would protect the outside windings of the core from tearing off.

While this form of cap is not as durable as my cap made from two pieces of metal, it is sufficiently strong for use where the cores are used but once. In these instances it is especially desirable owing to its lower manufacturing cost.

This application is a continuation in part of my application Serial No. 331,862, filed January 11, 1929.

I claim: j

1.'A core cap comprising an inner sleeve having an outwardly extending flange at one end thereof,a concentric outer sleeve having an inwardly extending flange at one end thereof, said flanges being associated in over lapping relation and inte rally joined to form a web of double thickness between said sleeves, and a portion of the inner sleeve being bent laterally into engagement with the outer sleeve to form a stud-receiving 3. A core cap comprising an inner sleeve having an outwardly extending flange at one end thereof, a concentric outer sleeve having an inwardly extending flange at one end thereof, said flanges being associated in overlapping relation and integrally joined at a plurality ofspaced points to form a web of double thickness between said sleeves, and the inner sleeve having a portion bent-laterally and integrally joined to the outer sleeve to form a stud-receiving cavity, the walls of said inner sleeve throughout the extent thereof and including the portion defining said cavity being of substantially uniform thickness.

l. A core cap comprising an'inner sleeve having anoutwardly extending flange at one end thereof, a concentric outer sleeve associated therewith and'having a portion joined to the flange portion of the inner sleeve to form a web between said sleeves, and a portion of the inner sleeve being bent laterally and integrally joined to the outer sleeve to form a stud-receiving cavity.

5. A core cap comprisingan inner sleeve and a concentric outer sleeve associated there with, a flange at one end of one of said sleeves extending toward and joined to a portion of the other said sleeve, and a portion of the inner sleeve being bent laterally and integrally joined to the outer sleeve to form a stud-receiving cavity, the walls of said inner sleeve throughout the extent thereof, and including the portion defining said cavity, being of substantially uniform thickness.

6. A core cap comprising an inner sleeve of sheet metal bent into cylindrical form with the longitudinal edges joined in overlapping relation, an outwardly-extending flange at one end of said sleeve, a concentric outer sleeve of sheet metal having an inwardlyextending flange at one end thereof, said flanges being associated in overlapping relation and integrally joined to form a web of double thickness between said sleeves, and said inner sleeve being bent laterally outward adjacent the point of union of its overlapped longitudinal edges to bring at least part of such overlapped portion into engagement with the outer sleeve to form a studreceiving cavity.

7. A core cap comprising an inner sleeve of sheet metal bent into cylindrical form with the longitudinal edges joined in overlapping relation, an outwardly-extending flange at one end of said sleeve, a concentric outer sleeve having an inwardly-extending flange at one end thereof,said flanges being associated in overlapping relation and integrally joined to form a web of double thickness between said sleeves, and a portion of said inner sleeve being bent laterally outward and integrally joined to the outer sleeve to form a stud-receiving cavity, such portion comprising at least part of that portion of the said inner sleeve represented by said overlapping edges.

8. A core cap comp-rising an inner sleeve and a concentric outer sleeve associated therewith, said sleeves being formed of thin sheet metal bent into cylindrical form with the longitudinal edges of the respective sleeves integrally joined, those of at least one sleeve being in overlapping relation, and a portion of said inner sleeve being bent laterally and integrally joined to the outer sleeve to form a stud-receiving cavity, said stud-receiving cavity being disposed on the periphery of said cap so as to include at least a portion of said overlapping longitudinal edges in the portions of the inner and outer sleeves integrally joined.

9. A core cap comprising a sleeve of sheet metal bent into cylindrical form with the edges.

V. H. WVICKWARE. 

